Games like Lost Skies
Games like Lost Skies include Valheim, Terraria, Green Hell, Dune: Awakening, and Grounded. We matched them by the tags players give Lost Skies on Steam (Adventure, Open World Survival Craft, Online Co-Op, Base Building, and Action): closest matches first, and among equally close ones the better-known games.

Valheim
Shared: Open World Survival Craft · Online Co-Op · Base Building

Terraria
Shared: Open World Survival Craft · Adventure · Sandbox

Green Hell
Shared: Open World Survival Craft · Online Co-Op · Action

Dune: Awakening
Shared: Open World Survival Craft · Adventure · Base Building

Grounded
Shared: Open World Survival Craft · Base Building · Adventure

The Forest
Shared: Open World Survival Craft · Adventure · Action

Once Human
Shared: Open World Survival Craft · Action · Open World

Palworld
Shared: Open World Survival Craft · Online Co-Op · Adventure

Raft
Shared: Open World Survival Craft · Base Building · Adventure

ARK: Survival Evolved
Shared: Open World Survival Craft · Adventure · Base Building

Don't Starve Together
Shared: Open World Survival Craft · Adventure · Online Co-Op

Rust
Shared: Open World Survival Craft · Adventure · Sandbox

Enshrouded
Shared: Base Building · Online Co-Op · Adventure

Starbound
Shared: Open World Survival Craft · Adventure · Sandbox

ICARUS
Shared: Open World Survival Craft · Base Building · Online Co-Op

7 Days to Die
Shared: Open World Survival Craft · Base Building · Online Co-Op

Grounded 2
Shared: Adventure · Base Building · Open World Survival Craft

Subnautica
Shared: Open World Survival Craft · Adventure · Base Building

The Planet Crafter
Shared: Open World Survival Craft · Base Building · Online Co-Op

ASTRONEER
Shared: Open World Survival Craft · Base Building · Adventure

Abiotic Factor
Shared: Open World Survival Craft · Online Co-Op · Base Building

No Man's Sky
Shared: Open World Survival Craft · Adventure · Exploration

The Lord of the Rings: Return to Moria™
Shared: Open World Survival Craft · Base Building · Online Co-Op

Core Keeper
Shared: Exploration · Sandbox · Open World